由于场地积水太多比赛被取消了。The match is off because of a waterlogged pitch.排干矿坑里的积水不容易.It was not easy to drain the flooded mine.雨后路面到处是一坑坑的积水.The road was filled with puddles from the rain....
She was dancing while someone substituted at the piano.她在跳舞,别人代她弹钢琴.The synthesis methods of melatonin, related tryptaminetryptamine derivatives and substituted indoles are discussed.从人工合成的角度综述了美乐托宁及有关化合物色胺、色胺衍生物及吲哚衍生物的制...